Also, the Hulk movies were seperated by five years. It would take serious balls to do another reboot after such a short time.
Batman & Robin and Batman Begins were 7 years apart. Superman Returns was only 6 years ago. Spiderman 3 was only 5 years ago. James Bond only had 4 years between Die Another Day and Casino Royale (nevermind the 20 films with different actors before that.)
Reboots and new origins keep coming faster and faster, and its just… not needed.